JPH11275480A - Digital video reception equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To watch different independent programs on plural monitors at one piece of digital video reception terminal by outputting an input multiplex digital signal after decoding it to a video signal, audio signal and data signal corresponding to the programs. SOLUTION: A multiplex signal 185 inputted to a multiplex data demultiplexer 105 is a multiplex signal so that plural programs are encoded and multiplexed into one stream, and composed of a bit stream composed of plural programs. At the multiplex data demultiplexer 105, the video signal, audio signal and data signal are demultiplexed out of the multiplex signal 185 and according to a program selection instruction signal 150 inputted from the outside, only the encoded data of the desired program are extracted. At a video decoder 106, respective video streams are decoded while using a clock signal 154 and a stream identification signal 155 corresponding to the inputted programs and video decoded signals 156a, 156b...156n for respective programs are outputted as video output signals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver for receiving digital video from a digital TV, a digital CATV or a digital broadcasting system.

[0002]

2. Description of the Related Art FIG. 14 shows, for example, Hattori, Tanaka, Asano,
Asai, Sakado: "Satellite-based broadcast quality codec", Mitsubishi Electric Technical Report, vol. 67, no. 7, pp33-38 (1
993).

Next, a conventional digital video receiving apparatus will be described with reference to FIGS. FIG. 13 is an example of a signal frequency arrangement on a satellite transponder in the two-wave transmission mode. In the figure, the high image quality mode refers to a mode in which two waves are transmitted per transponder and higher quality video and audio are transmitted, and SNG (Sa
Tellite News Gathering) The multiplex mode is a mode in which the SNG mode capable of transmitting a maximum of four waves with a transponder of a communication satellite Superbird is multiplexed into two programs and the video of two programs is transmitted in one wave. In FIG. 13, two waves are multiplexed, but a program of two channels is multiplexed for each wave. In the case where the two waves shown in FIG. 13 are separated and received simultaneously, four program receiving apparatuses 400 in FIG. 13 (2 [units] × 2)
[Program]) Required. In the high image quality mode, one program per wave is described because it is in the SNG multiplex mode (two programs per wave). However, as shown in FIG. 14, the decoding operation when the signal in the SNG multiplex mode is multiplexed in two waves will be described. explain.

[0004] In FIG. 14, the down-converter 402 of the received IF (intermediate frequency) signal 401 in FIG.
Select one of 511 or 512 waves shown in FIG.
One wave selected by the PSK demodulation circuit 403 is digitally demodulated, error-corrected by the Viterbi decoder 404, and 2C
An H separator 410 separates one wave signal into two programs. One of the program signals is supplied to a deinterleave section 41.
1. The error is corrected by the Reed-Solomon decoder 412 and the descrambling unit 413, and output to the demultiplexer 430.

[0005] The other program signal is supplied to a 2CH separator 41.
0 as a digital video output 422, and the digital video input 4 of another program receiving apparatus 400.
21 is input to the 2CH demultiplexer 410 and output to the demultiplexer 430 which has been error-corrected by the circuits 411, 412, and 413 in the same manner as described above.

In the conventional example, one SNG multiplex wave is composed of two programs. After being separated for each program by the 2CH separator 410, the VBI (vertical retrace interval) signal 431 is outputted by the multiplex separator 430. And outputs a video signal 441 to the terminal. The audio decoder 433 decodes the encoded audio signal input from the demultiplexer 430 and outputs an audio signal 422. Similarly, the communication line signal 443 is output from the order wire interface unit 434 and the terminal data signal 444 is output from the data interface unit 435.

[0007]

Conventionally, since only digitally encoded programs could be received, analog video images and digital video images could not be received by the same receiving terminal device.

Also, the conventional digital video receiving terminal device can only receive one digital video program and cannot display a multi-channel digital video screen.

Furthermore, in the conventional digital video receiving terminal device, independent digital video images cannot be displayed on a plurality of terminals (monitors).

A data separator in a conventional digital video receiver terminal only separates data accompanying only one program, and cannot output data corresponding to a plurality of digital video programs.

Further, a data decoder in a conventional digital video receiver terminal is, for example, an HDTV (High Definition Televisio) which is a high-quality digital TV.
If the operation required for decoding n) is 6 times as large as that of SDTV (Standard Definition Television), which is a normal digital TV, one HDTV image or one STV
Although decoding of a DTV image was possible, simultaneous decoding of a plurality of SDTV images and a plurality of SDTVs and one HDTV image was not possible.

[0012]

Means for Solving the Problems In the first invention,
A digital video receiving apparatus that receives a digital broadcasting service for multiplexing and delivering a program including a plurality of media such as video, audio, and data and supplies the program to a receiver receives a multiplexed signal and receives an analog signal. A tuner that branches into a baseband signal and a digital baseband signal, a demodulator that decodes the digital baseband signal supplied from the tuner, an encoded audio signal output by the demodulator, an encoded video signal, A multiplexed signal obtained by multiplexing a plurality of programs including media such as coded data signals is converted into a video signal, an audio signal, Multiplexed data that separates and outputs bit streams such as data signals and clocks corresponding to programs Demultiplexer, a video decoder for decoding a video signal separated by the multiplex data separator, an audio decoder for decoding an audio signal separated by the multiplex data separator, and a data signal separated by the multiplex data separator And a data decoder that decodes the input multiplexed digital signal into a video signal, an audio signal, and a data signal corresponding to a program and outputs the decoded signal.

In a second aspect, a video decoder comprises:
A bit stream splitter, comprising a plurality of video decoding units, each video decoding unit comprising a partial video decoder and a memory, a bit stream and a clock signal such as a video signal, an audio signal, and a data signal output from the multiplex data separator; And a video stream separated for each channel using the stream identification signal, and in each video decoding unit, the video stream signal for each channel is decoded and output as a video output signal by a partial video decoder and a memory. It is configured as follows.

In the third invention, the video signal, the audio signal output from the multiplexed data separator,
A video decoder, an audio decoder, and a data decoder, comprising a channel separator that generates a video stream, a clock signal, and a stream identification signal separated for each channel using a bit stream of a data signal, a clock signal, and a stream identification signal. The apparatus is configured to process each signal for each channel, decode and output image signals, audio signals, and data signals corresponding to programs.

In a fourth aspect, a video decoder comprises:
A plurality of video decoding units, each video decoding unit including a partial video decoder and a memory, wherein each video decoding unit outputs a video signal, an audio signal, a bit stream of a data signal, a clock signal, and a clock signal output from a channel separator. A video signal is decoded for each channel using the stream identification signal and output as a video output signal.

In the fifth invention, a digital broadcast service for multiplexing and delivering a program including a plurality of media such as video, audio and data is received.
Digital video receivers that provide programs to recipients
A tuner that receives a multiplexed signal and converts it into a digital baseband signal, a demodulator that decodes the digital baseband signal supplied from the tuner, an encoded video signal, an encoded audio signal, and an encoded signal output from the demodulator If the multiplexed signal in which the coded data signal is multiplexed is SDTV, a video signal, an audio signal, a bit stream of a data signal, a bit stream of a data signal, a clock corresponding to the program, When the stream identification signal is separated and output, or when the multiplexed signal is HDTV, the video signal, the audio signal, the bit stream of the data signal, the bit stream of the partial image, the clock corresponding to the partial image, and the stream identification signal are formed. Separate multiplexed data separator for output and separated by multiplexed data separator A video decoder for decoding a video signal, an audio decoder for decoding an audio signal separated by multiplexed data, a data decoder for decoding a data signal separated by the multiplexed data separator, and an output from the video decoder. A display conversion / synthesizer for performing signal conversion so as to display a plurality of video signals on one screen, an audio selector for selecting an audio signal output from an audio decoder, and data output from a data decoder. And a data selector for selecting a signal. In the case of SDTV, a plurality of programs can be synthesized into a video signal that can be displayed on one monitor, or in the case of HDTV, a plurality of partial images can be displayed on one monitor. It is configured to synthesize and output a video signal.

In a sixth aspect, a video decoder comprises:
A bit stream divider, a plurality of video decoding units, each video decoding unit including a partial video decoder and a memory, and when the input signal is SDTV,
The bit stream divider generates and outputs a video stream obtained by separating the video signal output from the multiplexed data separator for each channel according to the switching signal, and each video decoding unit decodes the video stream signal for each channel. Output as a video output signal.
In the case of TV, the bit stream splitter generates and outputs a video stream separated from each of the video signals output from the multiplexed data separator in accordance with the switching signal, and outputs each video decoding unit. And outputs the video stream signal as a video output signal.

In the seventh invention, the display conversion / synthesizer has a plurality of enlargers / reducers and a screen overlay unit. In the case of SDTV, a decoded signal input from a video decoder can be displayed on one monitor. It is configured to generate a video signal that can be displayed on a single monitor screen by superimposing and enlarging a plurality of enlarged / reduced image signals with a screen overlay unit so that the image signal becomes the size. Is done.

In the eighth invention, the NTSC
/ PAL decoder, the tuner receives the multiplexed signal and branches into an analog baseband signal and a digital baseband signal, and the NTSC / PAL decoder decodes the analog baseband signal supplied from the tuner, and converts the decoded video signal. Generate and display conversion synthesizer is NTSC / P
The analog image signal from the AL decoder and the digital image signal from the video decoder are combined to generate a video signal capable of displaying the analog image signal and the digital image signal on one monitor.

In a ninth aspect, a display conversion / synthesizer includes a screen reproducer and a screen overlay unit.
A digital HDTV image signal is synthesized from a video decoder to generate a video signal to be displayed on one monitor. On the other hand, when an analog TV signal from an NTSC / PAL decoder is present, an HDTV image signal and an analog TV signal are output.
The signals are superimposed by a screen overlay unit to generate a video signal that can be displayed on one monitor screen.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Next, a digital video receiving apparatus according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a schematic configuration of a digital video receiving apparatus according to Embodiment 1 of the present invention. In FIG. 1, 111 is an input terminal, 103 is a tuner, 104
Is a demodulator, 105 is a multiplex data separator, 106 is a video decoder, 107 is an audio decoder, 108 is a data decoder, 149 is an input received signal, 150 is a program selection instruction signal, 153 is a video stream, 153 is a clock. The signal 155 is a stream identification signal, and (156a, 156)
.. 156n) are video output signals, (157a,
157b) are audio output signals,
(160a, 160b... 160n) are data output signals, and 185 is a multiplexed signal.

Next, the operation of the digital video receiving apparatus according to the first embodiment of the present invention will be described. Input terminal 11
From the input received signal input to 1, necessary signal components are extracted by the tuner 103, demodulated by the demodulator 104, become a multiplexed signal 185, and input to the multiplexed data separator 105. The multiplexed signal 18 input to the multiplexed data separator 105
Reference numeral 5 denotes a multiplexed signal in which a plurality of programs are encoded and multiplexed into one stream. As shown in FIG. 12, the multiplexed signal 185 includes a bit stream including a plurality of programs. . In FIG. 12, multiplexed signal 1
Reference numeral 85 includes an n-channel video signal, an n-channel audio signal, and an n-channel data signal. The header of each video signal, audio signal, and data signal includes accompanying data required for each channel, such as a clock.

The multiplexed data separator 105 separates a video signal, an audio signal, and a data signal from the multiplexed signal 185, and outputs a coded data of a desired program according to a program selection instruction signal 150 input from the outside. Take out only. For example, the separated video signal includes a video stream 153, a clock signal 154 corresponding to a program, and a stream identification signal 155 which is a control signal for extracting a program, and is output to the video decoder 106. The separated audio signal includes an audio stream signal 170 and a clock signal 171 corresponding to a program.
And a stream identification signal 172 which is a control signal for extracting a program, and is output to the audio decoder 107. On the other hand, the separated data signal includes the separated data signal 180, the clock signal 181 corresponding to the program, and the stream identification signal 182 which is a control signal for extracting the program, and is output to the data decoder 108.

In the video decoder 106, the clock signal 154 and the stream identification signal 15 corresponding to the input program are inputted.
5, each video stream is decoded, and video decoded signals (156a, 156b,... 156) for each program are decoded.
n) as a video output signal.

Next, the video decoder 106 in the digital video receiver according to the first embodiment of the present invention will be described with reference to FIG. In FIG. 2, reference numeral 201 denotes a bit stream divider that divides an input bit stream for each program;
(202a, 202b... 202n) are video decoding units for each channel, and (203a, 203b...)
.. 203n) is a channel video decoder for decoding a video signal for each channel, (204a, 204b... 2)
04n) is a memory for each channel used for decoding a video signal, (250a, 250b... 2)
50n) is a video bit stream for each channel.

Next, the operation of the video decoder 106 will be described. The video stream 153 input to the video decoder 106 is divided into bit streams for each channel corresponding to the program using the stream identification signal 155, and the bit stream of channel a (CHa) is output to the video decoding unit 202a and the channel b The (CHb) bit stream is sent to the video decoding unit 202b, and the channel c (CHc) bit stream is sent to the video decoding unit 202c.

Each video decoding unit (202a, 202
... 202n) are conventional SDTV (Standard Def.
inition TV) class video decoding processing capability.
Each video decoding unit (202a, 202b... 2)
02n), each video stream (250a, 250b... 250n) divided for each channel is decoded, and a video output signal (15
6a, 156b... 156n). Here, at the time of video decoding, the video decoding unit (202
a, 202b... 202n) perform video decoding using the supplied video clock 154 as a master clock. Each video decoding unit (202a, 202b
.. 202n) decodes the video signals using the internal channel video decoders (2032a, 203b... 203n) and the memory 204, and outputs the respective video output signals (156a, 156b. ) Is output.

The audio decoder 107 decodes the input audio stream 170, and decodes audio decoded signals (157a, 157b,...) For each program.
157n) is output as an audio output signal. Similarly, the data decoder 108 also decodes the input data stream 180 and outputs decoded data signals (160a, 160b,..., 160n) for each program as data output signals.

FIG. 3 shows a digital video receiving apparatus according to the first embodiment of the present invention in which a plurality of monitors (332a, 332b,
.. 332n) are connected. In FIG. 3, (330a, 330b,..., 330)
n) indicates a video output terminal. Video output terminal 330a
Includes a video output signal 156a, an audio output signal 157a, and a data output signal 160a shown in FIG. 1, and a video output terminal 330b is connected to the video output signal 156 shown in FIG.
b, audio output signal 157b, data output signal 16
0b, and the video output terminal 330n is a signal including the video output signal 156n, the audio output signal 157n, and the data output signal 160n shown in FIG. As described above, the output signals from the video decoder 106, the audio decoder 107, and the data decoder 108 are output as a set to each monitor.
Audio and data can be reproduced.

Video decoded signals (156a, 156b... 156n) output from the video decoder 106, the audio decoder 107, and the data decoder 108;
Audio decoded signals (157a, 157b ... 15)
7n), the data decoded signals (160a, 160b,...)
.160n) is output from the digital video receiving terminal of the present invention as an independent signal, so that different images can be viewed on different monitors by connecting different monitors to the terminals of the digital video receiving apparatus.

Embodiment 2 Next, a digital video receiver according to a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a diagram showing a schematic configuration of a digital video receiving apparatus according to Embodiment 2 of the present invention. In the second embodiment, the multiplexed video stream separated by the multiplex data separator is further supplied to a video decoder separated for each channel by a channel separator. In FIG. 4, 111
Is an input terminal, 103 is a tuner, 104 is a demodulator, 10
5 is a multiplexed data separator, 106 is a video decoder, 107
Is an audio decoder, 108 is a data decoder, 115 is a channel separator, 153a to 153n are multiplexed video streams, 154 is a clock signal, (156a, 156)
.. 156n) are video output signals, 157 is an audio output signal, 160 data output signals, (170a,
170b) are audio streams,
(180a, 180b... 180n) are multiplexed data signals, and 185 is a multiplexed signal.

Next, the operation of the digital video receiving apparatus according to the second embodiment of the present invention will be described. Input terminal 11
1 is input to the input terminal 111 of the digital video receiver, and the multiplexed digital signal is input to the tuner 10.
3 and is demodulated by the demodulator 104 to become a multiplexed signal, which is input to the multiplexed data separator 105. The multiplexed signal 185 input to the multiplexed data separator 105 has the same stream configuration as in the first embodiment.

The multiplexed data separator 105 generates a video stream, a clock signal and a stream identification signal for separating channels from the multiplexed signal 185, and the multiplexed data separator 105
The channel separation video stream (1) separated for each channel using the stream identification signal 155 generated in
153n) and the channel separation clock signal (154) separated for each channel.
a, 154n,... 154n). In the video decoder 106, the channel-separated video streams (153a, 153b,...
n) with the channel separation clock signals (154a, 154).
, 154n) to decode video decoded signals (156a, 156b,... 156) for each program.
n) as a video output signal.

In the audio decoder 107, each audio stream (170a, 170a,
.. 170n), and audio decoded signals (157a, 157b,... 157) for each program.
n) as an audio output signal. Similarly, in the data decoder 108, each data stream (180a, 180b,.
80n) and decode the data decoded signal (160
a, 160b,... 160n) are output as data output signals.

Video decoded signals (156a, 156b,... 156n) and audio decoded signals (157a, 157b,.
7n) and the data decoded signals (160a, 160b,...)
.. 160n) are connected to n monitors in the same manner as in the first embodiment shown in FIG.

Video decoded signals (156a, 156b... 156n) output from the video decoder 106, the audio decoder 107, and the data decoder 108;
The audio decoded signal 157 and the data decoded signal (160
.. 160n) are output from the digital video receiving terminal of the present invention as independent signals, so that by connecting different monitors to the terminals of the digital video receiving apparatus, different images can be output on different monitors. You can see.

Next, the video decoder 106 in the digital video receiver according to the second embodiment of the present invention will be described with reference to FIG. In FIG. 5, the input signal to video decoder 106 is not a multiplexed video signal in which nCH video signals are multiplexed, but is a video signal already separated for each channel. Decoder 106
And different. In FIG. 5, (202a, 202b...)
202n) is a video decoding unit, (203a, 20)
.. 203n) is a video decoder for each channel,
(204a, 204b ... 204n) are memories.

The video stream 153a, clock signal 154a, and stream identification signal 155a input to the video decoder 106a for decoding the video channel a of the video decoder 106 are sent to the video decoding unit 202a. The operation in the video decoding unit 202a is shown in FIG.
And the detailed description is omitted. Similarly, the video decoded signal (156b,...) Is applied to the other channels of the video decoder 106.
156n) is output. These video decoded signals (15
6a, 156b... 156n), a different video image is reproduced for each channel by connecting a monitor.

Embodiment 3 Next, a digital video receiving apparatus according to a third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a diagram showing a schematic configuration of a digital video receiving apparatus according to Embodiment 3 of the present invention. In FIG. 6, 11
1 is an input terminal, 103 is a tuner, 104 is a demodulator, 1
05 is a multiplexed data separator, 106 is a video decoder, 10
7 is an audio decoder, 108 is a data decoder, 109
Is a display conversion synthesizer, 110 is an audio selector, 115
, 148 is a data selector, 148 is a selection instruction signal, 153 is a video stream, 154 is a clock signal, 155 is a stream identification signal, (156a, 156b,.
n) is a video decoded signal, (157a, 157b...)
157n) is an audio decoded signal, 158 is a video output signal, 159 is an audio output signal, (160a,
.. 160n) is the data decoded signal, 16
1 is a data output signal, and 185 is a multiplexed signal.

Next, the operation of the digital video receiving apparatus according to the third embodiment of the present invention will be described. Input terminal 11
The multiplexed digital signal inputted to the tuner 10
3, a desired signal component is extracted and demodulated by the demodulator 104 to become a multiplexed signal 185.
To enter. The digital video receiver of the third embodiment is different from the digital video receivers of the first and second embodiments in that a normal SDTV signal is supplied to the input terminal 1 in the latter.
In the embodiment of the present invention, the signal input to the input terminal 111 is an SDTV signal and / or an HDTV, while the signal input to the input terminal 11 is input to the input terminal 11. In the SDTV, up to the processing of the video decoder 106, the first embodiment
Is the same as the digital video receiver described in
As for DTV, the bandwidth of the signal is wide, and each video decoder 106 cannot decode all HDTV signals at once. Accordingly, the HDTV signal is reproduced by dividing the HDTV signal into partial signals corresponding to a plurality of screens, decoding each divided partial signal by each video decoder 106, and then combining the decoded signals.

Next, when the SDTV and / or HDTV are input to the video decoder 106, the video decoder 10
The operation of No. 6 will be described. Bitstream splitter 2
01 indicates that the input bit stream 153 is HDTV (Hi
gh Definition TV) or conventional SDTV (Standard Defin)
The switching signal 205 switches the division method depending on the setting. This switching signal 205 is the video stream 15
The information may be generated inside the bit stream divider 201 according to the three types.

First, the case where the signal input to the video decoder 106 is SDTV will be described. In the bit stream divider 201, the video stream 153, the clock signal 154, and the stream identification signal 155 input to the video decoder 106 are divided for each channel, and each video decoding unit (202a, 202b ... 202n)
Sent to In this case, video decoded signals (156a, 156b,..., 156n) are output from the video decoder 106, but the method of generating them is the same as that of the first embodiment, and a description thereof will be omitted.

Next, the case where the signal input to the video decoder 106 is HDTV will be described. Video decoder 10
The HDTV signal input to the video decoder 106 includes the video stream 153 and the clock signal 15 input to the video decoder 106.
4. Divided into partial video signals corresponding to each partial screen based on the stream identification signal 155 and sent to each video decoding unit (202a, 202b,..., 202n). Each video decoding unit (202a, 202b
.. 202n) is a partial video decoder (2032a,
203n), each partial video signal is decoded, and if necessary, each adjacent video decoding unit (20
2a, 202b... 202n), the video decoding unit connection lines (255a, 25
... 255n) and memory (204a, 20)
4b... 204n) to perform a decoding process, and decode the partial video decoded signals (156a, 156b.
156n) is output.

Next, the video decoded signals (156a, 156b... 156) output from the video decoder 106 are output.
n) is input to the display conversion synthesizer 109. In the display conversion / combiner 109, the video output signal (156a,
. 156n) are combined to display a plurality of divided screens on one monitor. Examples are shown in FIG. 8 and FIG.

FIG. 8 is a diagram showing an example in which a plurality of SDTV decoded signals are displayed on one monitor. In FIG.
109 is a display conversion / synthesizer 109, (310a, 310b)
... 310n) is an enlargement / reduction device, 302 is a screen overlay unit, (332a, 332b,.
2n) is a monitor. 8, the decoded video signals (156a, 156) input to the display
.. 156n) are input to the scalers (310a, 310b... 310n) for each channel,
Therefore, the image is enlarged / reduced to a desired size in relation to the monitor, synthesized by the screen overlay unit 302, output to the monitor 332 as a synthesized signal 352, and output to the monitor 332.
Are displayed on one screen.

FIG. 9 is a diagram showing an example in which an HDTV image divided into a plurality of partial video signals and decoded respectively is displayed on one monitor. 9, reference numeral 109 denotes a display conversion / synthesizer 109, (310a, 310b ... 310)
n) is an enlargement / reduction device, 302 is a screen overlay unit, and 332 is a monitor. In FIG. 9, the partial video decoded signal (156
., 156n) are input to the enlargement / reduction units (310a, 310b,..., 310n) for each part, where they are enlarged / reduced to a desired size depending on the positional relationship with the monitor.
Scaled down, synthesized by the screen overlay unit 302,
The HDTV image is output to the monitor 332 as the synthesized signal 352, and one HDTV image is displayed on the monitor 332.

The audio decoder 107 decodes a plurality of input audio streams 170, sends them to the audio selector 110, and selects a desired audio signal according to the audio selection instruction signal (in this case, for example, 157a are selected) and output as the audio output signal 159. Similarly, in the data decoder 108, the data stream 1
80, and the desired data decoded signal 160a is output as the selected data output signal.

Embodiment 4 Hereinafter, a digital video receiving apparatus according to a fourth embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 10 is a diagram showing a schematic configuration of a digital video receiving apparatus according to Embodiment 4 of the present invention.
In FIG. 10, 101 is a tuner, 102 is NTSC
/ PAL decoder, 104 is a demodulator, 105 is a multiplexed data separator, 106 is a video decoder, 107 is an audio decoder, 108 is a data decoder, 109 is a display conversion / synthesizer, 110 is an audio selector, 115 is data A selector 148 is a selection instruction signal, 149 is a digital baseband signal, 151 is an analog baseband signal,
2 is an analog video signal, 153 is a video stream,
154 is a clock signal, 155 is a stream identification signal,
.. 157n are audio decoded signals, (157a, 157b... 157n) are audio decoded signals, 158 is a video output signal, 159 is an audio output signal, (160a, 160b. 16
0n) is a data decoded signal, 161 is a data output signal,
185 is a multiplexed signal.

Next, the operation of the digital video receiving apparatus according to the fourth embodiment of the present invention shown in FIG. 10 will be described. A received signal received via satellite communication or terrestrial communication is converted into an analog baseband signal 15 by the tuner 3.
1 and a digital baseband signal 149, the analog baseband signal 151 is converted to an analog video signal 152 by the NTSC / PAL decoder 102, the digital baseband image signal 149 is demodulated by the demodulator 104, and the multiplexed data separator 105 Is input to The multiplexed signal 185 input to the multiplexed data separator 105 is obtained by encoding a plurality of programs and multiplexing them into one stream.
It is a DTV signal or a signal 1 carrying one HDTV.
FIG. 12 shows a bit stream composed of a plurality of programs in SDTV.

The multiplexed data separator 105 separates the input multiplexed signal 185 into a video signal, an audio signal, and a data signal.
The clock signal and the stream identification signal are separated and output. For example, in the case of SDTV, for a video signal, the multiplex data separator 105 outputs a video stream 153, a clock signal 154 corresponding to a program, and a stream identification signal 155 which is a control signal for selecting a program.
Is output to the video decoder 106. For the audio signal, the multiplexed data separator 105 outputs to the audio decoder 107 an audio stream signal 170, a clock signal 171 corresponding to the program, and a stream identification signal 172 which is a control signal for selecting a program. The same applies to data signals. In the case of HDTV, a partial signal stream 154, a clock signal 154 corresponding to the partial signal, and a stream identification signal 155 which is a control signal for selecting the partial signal from the multiplexed signal 185 are output to the video decoder 106. In the case of SDTV, only necessary programs are extracted and output as a video stream 153 according to a selection instruction signal 148 input from the outside.

In the video decoder 106, the SDTV
In this case, the video output signal (156
a, 156b... 156n) are output, and the HDTV
In the case of, the video decoded signal (156a, 1
, 156n) are output. The decoding method in the video decoder 106 is the same as in the third embodiment, and a description thereof will not be repeated.

Display Conversion Combiner 10 in Embodiment 4
9 synthesizes the HDTV video decoded signals (156a, 156b... 156n) output from the video decoder 106, and also, if there is an analog video 152 output from the NTSC / PAL decoder 102, the image thereof is also converted. The images are combined on one screen and output as a video signal 158. FIG. 11 shows an example of the screen combining method.

FIG. 11 shows one HDTV image and one S
An example in which DTV images are simultaneously decoded and displayed on the same screen on a message will be described. In FIG. 11, the video decoder 10
HDTV video decoded signal (156a,
156n) synthesizes a plurality of partial video signals in the screen reproducer 301 and reproduces the signals on the HDTV image, and furthermore, in the case of performing analog video and picture-in-picture, the screen overlay unit 302 Processing analog screen and digital HDTV
The video signal 158 is output with the screen as one screen. The signal allows the monitor 332 to display an analog image and an HDTV image on one screen in a picture-in-picture format. Note that the multiplexed signal 185 is SDTV
In the case of, as described in Embodiment 3, a plurality of SDTV video signals are synthesized by the screen reproducer 301, and then the plurality of SDTV images and the analog image are combined by the screen overlay unit 302 into one monitor screen. It can also be displayed above.

[0054]

According to the first aspect of the present invention, a digital video service for multiplexing and distributing a program including a plurality of media such as video, audio, data and the like and supplying the program to a receiver is provided. The receiving device receives a multiplexed signal, divides the signal into an analog baseband signal and a digital baseband signal, a demodulator that decodes the digital baseband signal supplied from the tuner, and a coding device that is output by the demodulator. A multiplexed signal obtained by multiplexing a plurality of programs including media such as an encoded audio signal, an encoded video signal, and an encoded data signal into one or more programs selected by an external selection signal. , The video signal, audio signal, data signal, etc. that constitute the program And multiple data separator separates and outputs the lock, and a video decoder for decoding a video signal separated by the multiplexed data separator, and an audio decoder for decoding an audio signal separated by the multiplexed data separator,
A data decoder that decodes the data signal separated by the multiplex data separator, and is configured to decode and output an input multiplexed digital signal to a video signal, an audio signal, and a data signal corresponding to a program, In one digital video receiving terminal device, it is possible to watch independent and different programs on a plurality of monitors.

In the second invention, the video decoder comprises:
A bit stream splitter, comprising a plurality of video decoding units, each video decoding unit comprising a partial video decoder and a memory, a bit stream and a clock signal such as a video signal, an audio signal, and a data signal output from the multiplex data separator; And a video stream separated for each channel using the stream identification signal, and in each video decoding unit, the video stream signal for each channel is decoded and output as a video output signal by a partial video decoder and a memory. With such a configuration, it is possible to watch independent and different programs on a plurality of monitors in one digital video receiving terminal device.

In the third invention, the video signal, the audio signal, and the
A video decoder, an audio decoder, and a data decoder, comprising a channel separator that generates a video stream, a clock signal, and a stream identification signal separated for each channel using a bit stream of a data signal, a clock signal, and a stream identification signal. The processing unit processes each signal for each channel and decodes and outputs an image signal, an audio signal, and a data signal corresponding to a program. It becomes possible to watch different programs.

In the fourth invention, the video decoder comprises:
A plurality of video decoding units, each video decoding unit including a partial video decoder and a memory, wherein each video decoding unit outputs a video signal, an audio signal, a bit stream of a data signal, a clock signal, and a clock signal output from a channel separator. Since a video signal is decoded for each channel and output as a video output signal using the stream identification signal, independent digital programs can be viewed on a plurality of monitors in one digital video receiving terminal device. become.

In the fifth invention, a digital broadcast service for multiplexing and delivering a program including a plurality of media such as video, audio and data is received.
Digital video receivers that provide programs to recipients
A tuner that receives a multiplexed signal and converts it into a digital baseband signal, a demodulator that decodes the digital baseband signal supplied from the tuner, an encoded video signal, an encoded audio signal, and an encoded signal output from the demodulator If the multiplexed signal in which the coded data signal is multiplexed is SDTV, a video signal, an audio signal, a bit stream of a data signal, a bit stream of a data signal, a clock corresponding to the program, When the stream identification signal is separated and output, or when the multiplexed signal is HDTV, the video signal, the audio signal, the bit stream of the data signal, the bit stream of the partial image, the clock corresponding to the partial image, and the stream identification signal are formed. Separate multiplexed data separator for output and separated by multiplexed data separator A video decoder for decoding a video signal, an audio decoder for decoding an audio signal separated by multiplexed data, a data decoder for decoding a data signal separated by the multiplexed data separator, and an output from the video decoder. A display conversion / synthesizer for performing signal conversion so as to display a plurality of video signals on one screen, an audio selector for selecting an audio signal output from an audio decoder, and data output from a data decoder. And a data selector for selecting a signal. In the case of SDTV, a plurality of programs can be synthesized into a video signal that can be displayed on one monitor, or in the case of HDTV, a plurality of partial images can be displayed on one monitor. Since it is configured to combine and output a video signal, one digital video receiving terminal views one HDTV resolution image. With bets can be, it is possible to see a plurality of SDTV resolution programs simultaneously.

In a sixth aspect, a video decoder comprises:
A bit stream divider, a plurality of video decoding units, each video decoding unit including a partial video decoder and a memory, and when the input signal is SDTV,
The bit stream divider generates and outputs a video stream obtained by separating the video signal output from the multiplexed data separator for each channel according to the switching signal, and each video decoding unit decodes the video stream signal for each channel. Output as a video output signal.
In the case of TV, the bit stream splitter generates and outputs a video stream separated from each of the video signals output from the multiplexed data separator in accordance with the switching signal, and outputs each video decoding unit. Is configured to decode the video stream signal and output it as a video output signal, so that one digital video receiving terminal can view one HDTV resolution image and
A plurality of SDTV resolution programs can be viewed simultaneously.

In the seventh invention, the display conversion / synthesizer has a plurality of enlargers / reducers and a screen overlay unit. In the case of SDTV, a decoded signal input from a video decoder can be displayed on one monitor. It is configured to generate a video signal that can be displayed on a single monitor screen by superimposing and enlarging a plurality of enlarged / reduced image signals with a screen overlay unit so that the image signal becomes the size. Therefore, one HDTV resolution image can be viewed by one digital video receiving terminal, and a plurality of SDTV resolution programs can be simultaneously viewed.

[0061] In the eighth invention, furthermore, NTSC
/ PAL decoder, the tuner receives the multiplexed signal and branches into an analog baseband signal and a digital baseband signal, and the NTSC / PAL decoder decodes the analog baseband signal supplied from the tuner, and converts the decoded video signal. Generate and display conversion synthesizer is NTSC / P
Since the analog image signal from the AL decoder and the digital image signal from the video decoder are combined to generate a video signal capable of displaying the analog image signal and the digital image signal on one monitor, the digital It is possible to simultaneously decode the digital program transmitted in the above and the analog program transmitted in the analog manner and display them on the same monitor.

In a ninth aspect, a display conversion / synthesizer includes a screen reproducer and a screen overlay unit.
A digital HDTV image signal is synthesized from a video decoder to generate a video signal to be displayed on one monitor. On the other hand, when an analog TV signal from an NTSC / PAL decoder is present, an HDTV image signal and an analog TV signal are output.
It is configured to generate a video signal that can be displayed on one monitor screen by superimposing the signals on the screen overlay unit, so that digital programs transmitted digitally and analog programs transmitted analogly can be decoded simultaneously. Can be displayed on the same monitor.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a digital video receiving device according to a first embodiment.

FIG. 2 is a diagram illustrating a video decoder used in the digital video receiving device according to the first embodiment.

FIG. 3 is a diagram showing a state in which a plurality of monitors are connected to the digital video receiving device according to the first embodiment.

FIG. 4 is a diagram showing a configuration of a digital video receiving device according to a second embodiment.

FIG. 5 is a diagram illustrating a video decoder in a digital video receiving device according to a second embodiment.

FIG. 6 is a diagram illustrating a configuration of a digital video receiving device according to a third embodiment.

FIG. 7 is a diagram illustrating a video decoder used in a digital video receiving device according to a third embodiment.

FIG. 8 is a diagram illustrating an example in which a plurality of SDTV signals are displayed on one monitor in the digital video receiving device according to the third embodiment.

FIG. 9 is a diagram illustrating an example in which an HDTV image is displayed on one monitor in the digital video receiving device according to the third embodiment.

FIG. 10 is a diagram showing a configuration of a digital video receiving device according to a fourth embodiment.

FIG. 11 is a diagram showing one SDTV image and one HDTV image in the digital video receiving apparatus according to the fourth embodiment.
FIG. 7 is a diagram showing an example of displaying on one monitor.

FIG. 12 is a diagram illustrating a configuration example of a multiplexed signal according to the embodiment of the present invention.

FIG. 13 is a diagram illustrating an example of a signal frequency arrangement on a satellite transponder according to the related art.

FIG. 14 is a diagram illustrating an example of a digital video receiving terminal device according to the related art.

[Explanation of symbols]

102 NTSC / PAL decoder, 103 tuner, 104 demodulator, 105 multiplex data separator,
106 video decoder, 107 audio decoder, 108 data decoder, 109 display conversion / combiner, 110 audio selector, 201 bit stream divider, 202 video decoding unit, 2
03 channel video decoder or partial video decoder,
204 memory, 255 connection lines between video decoding units, 302 screen overlay unit, 310 scaler, 332 monitor

Claims (9)

[Claims] 1. A digital video receiving apparatus for receiving a digital broadcasting service for multiplexing and delivering a program including a plurality of media such as video, audio, data and the like and supplying the program to a receiver. And a tuner that receives and divides the digital baseband signal into an analog baseband signal and a digital baseband signal; a demodulator that decodes the digital baseband signal supplied from the tuner; and an encoded audio signal and code output by the demodulator. A multiplexed signal obtained by multiplexing a plurality of programs including media such as a coded video signal and an encoded data signal is formed for one or more programs selected by an external selection signal. Separate bit streams such as video signals, audio signals, and data signals and clocks for programs. A multiplexed data separator for separating and outputting; a video decoder for decoding a video signal separated by the multiplexed data separator; an audio decoder for decoding an audio signal separated by the multiplexed data separator; A data decoder for decoding the data signal separated by the data separator, wherein the input multiplexed digital signal is decoded into a video signal, an audio signal, and a data signal corresponding to a program and output. apparatus. 2. The digital video receiving apparatus according to claim 1, wherein said video decoder comprises a bit stream divider, a plurality of video decoding units, each said video decoding unit comprises a partial video decoder and a memory, The video signal output from the multiplexed data separator, audio signal, using a bit stream such as a data signal and a clock signal and a stream identification signal, to generate a video stream separated for each channel, In each video decoding unit, A digital video receiving apparatus wherein a video stream signal for each channel is decoded by a partial video decoder and a memory and output as a video output signal. 3. The digital video receiver according to claim 1, further comprising: a bit stream of a video signal, an audio signal, and a data signal output from the multiplexed data separator.
A video stream separated for each channel using a clock signal and a stream identification signal, a channel separator for generating a clock signal and a stream identification signal, wherein the video decoder, the audio decoder, and the data decoder are provided for each channel. A digital video receiving apparatus which processes each signal, decodes and outputs an image signal, an audio signal, and a data signal corresponding to a program. 4. The digital video receiving device according to claim 1, wherein the video decoder comprises a plurality of video decoding units, each of the video decoding units comprises a partial video decoder and a memory. Decoding a video signal for each channel using a video signal, an audio signal, a bit stream of a data signal, a clock signal, and a stream identification signal output from the channel separator, and outputting the decoded video signal as a video output signal. Digital video receiver. 5. A digital video receiving apparatus for receiving a digital broadcast service for multiplexing and delivering a program including a plurality of media such as video, audio, data and the like and supplying the program to a receiver. , A tuner that receives and converts a digital baseband signal into a digital baseband signal, a demodulator that decodes the digital baseband signal supplied from the tuner, an encoded video signal, an encoded audio signal, and encoded data output from the demodulator If the multiplexed signal is an SDTV, the video signal, the audio signal, the bit stream of the data signal, the clock corresponding to the program, and the stream identification corresponding to one or more programs selected by an external selection instruction signal Separate and output signals, or if the multiplexed signal is HDTV, A multiplexed data separator that separates and outputs a video signal, an audio signal, a bit stream of a data signal, a clock and a stream identification signal corresponding to the partial image, and a video signal separated by the multiplexed data separator A video decoder for decoding an audio signal separated by the multiplexed data; a data decoder for decoding a data signal separated by the multiplexed data separator; and an output from the video decoder. Multiple video signals
A display conversion / synthesizer for performing signal conversion so as to be displayed on one screen, an audio selector for selecting an audio signal output from the audio decoder, and data for selecting a data signal output from the data decoder A selector is provided to combine a plurality of programs into a video signal that can be displayed on one monitor in the case of SDTV, or a plurality of partial images into a video signal that can be displayed on one monitor in the case of HDTV. A digital video receiving apparatus characterized in that the digital video signal is output. 6. The digital video receiving apparatus according to claim 5, wherein the video decoder comprises a bit stream divider, a plurality of video decoding units, each of the video decoding units comprises a partial video decoder and a memory, When the input signal is SDTV, the bit stream divider generates and outputs a video stream in which the video signal output from the multiplexed data separator is separated for each channel in accordance with the switching signal, and outputs the video stream. Then, the video stream signal is decoded for each channel and output as a video output signal. When the input signal is HDTV, the bit stream divider separates the video signal output from the multiplexed data separator according to the switching signal. Generate and output separated video streams for each part and decode each video In the unit,
A digital video receiving apparatus for decoding a video stream signal for each part and outputting the decoded video stream signal as a video output signal. 7. The digital video receiving apparatus according to claim 5, wherein the display conversion / combination unit has a plurality of enlargement / reduction units and a screen overlay unit, and in the case of SDTV, a decoded signal input from a video decoder. Is enlarged to a size that can be displayed on one monitor.
The image is enlarged / reduced by a reducer, and the plurality of enlarged / reduced image signals are superimposed by a screen overlay unit to form one image.
A digital video receiver for generating a video signal that can be displayed on two monitor screens. 8. The digital video receiving apparatus according to claim 5, further comprising an NTSC / PAL decoder, wherein the tuner receives the multiplexed signal and splits the multiplexed signal into an analog baseband signal and a digital baseband signal. The PAL decoder decodes the analog baseband signal supplied from the tuner to generate a decoded video signal, and the display conversion / synthesizer converts the analog image signal from the NTSC / PAL decoder and the digital image signal from the video decoder. A digital video receiving apparatus for synthesizing and generating a video signal capable of displaying an analog image signal and a digital image signal on one monitor. 9. The digital video receiving apparatus according to claim 8, wherein the display conversion / synthesizer has a screen reproducer and a screen overlay unit, and synthesizes a digital HDTV image signal from a video decoder and displays the image on one monitor. A video signal to be output, and when an analog TV signal from the NTSC / PAL decoder is present, an HDTV image signal and an analog TV signal are output.
A digital video receiving apparatus for generating a video signal that can be displayed on one monitor screen by superimposing signals on a screen overlay unit.